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Gilchrist, J.; Mandelbaum, B. R.; Melancon, H.; Ryan, G. W.; Silvers, H. J.; Griffin, L. Y.; Watanabe, D. S.; Dick, R. W.; Dvorak, J. . (2008). A Randomized Controlled Trial to Prevent Noncontact Anterior Cruciate Ligament Injury in Female Collegiate Soccer Players. The American Journal of Sports Medicine, 36(8), 1476–1483. doi:10.1177/0363546508318188 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research